Kylie Jenner bailed out on her sister Kendall Jenner at the last minute for a quick trip to Las Vegas on this week's The Kardashians.Kendall, 26, was planning on getting to hang out with her sister during a quick Vegas jaunt, to promote her 818 tequila brand.While the 25-year-old Kylie was originally planning on going - telling Kendall she hasn't had a night out in a year - she ultimately bailed... which Kendall mentioned to friends Hailey Bieber and Justine Skye... though they still all got to use Kylie's private jet...